Generally my mower works quite well, however it has difficulty with
grass that is long and damp (not an unusual combination at the start of
the mowing season in these parts!). This year was particularly bad since
the ground was so water logged there was a substatial delay before the
ground was firm enough to actually mow.
One of the problems being that my machine is designed to either cut and
collect, or to mulch. It does not have the option to simply cut and
drop. The net result is that it tries collecting, and then quickly clogs
with wet grass, and then is by default trying to mulch. Even on its
highest setting it soon bogs down trying to do that because all the cut
grass is trapped in the deck.
Has anyone tried a (reversible) modification to a mower deck to open a
"flap" in the side or back of it to allow grass to escape?
Depends on the design of the offtake for the cut grass into the grass
collector. Mine is a spring-loaded flap, which is held open when the
collecting bag is in place, but shuts in 'mulching mode'. It's not
actually a mulching mower, and I get exactly the same problem as you
when cutting longish wet grass. I have a short (8") bit of batten,
about 1" square section, that I jam under the hinge-line of the flap,
that holds it open but slightly angled downwards so the grass cuttings
that get thrown out, backwards, don't fill my boots but are directed
down to the ground.
Mine has a pair of contra rotating blades, and the take off is a port in
the top back of the deck in the middle. That is connected to a plastic
tunnel (probably about 8" square) that then feeds through the back of
the machine, out the back and into the grass box. So the blades
naturally "throw" the grass in the direction of the outlet, and they are
also shaped to create a fairly significant updraft (if you defeat the
interlock that senses when the grass box is attached, then it will blow
grass a good 12' out the back of the mower!)
Alas on mine I have tried similar - even if I defeat the grass box
interlock (which I have done permanently with a batten tied under the
cams that sense its presence), so it just discharges into thin air, it
will still clog near the deck in the first 12" or so of grass tunnel.
That sounds like my Jonsered!
I fabricated a deflector from aluminium sheet to give a better spread
and reduce the amount of clippings blown down my neck by the wind!
The plastic tunnel is retained by two spring hooks and the deflector is
shaped to be trapped by the tunnel top and flange.
A short length of wood and a spring clip takes care of the grass box
I found that regular use of the mulching device left rows of rotting
trimmings which eventually damaged the grass. Altering the cutting route
might have got round this but I'm mowing a strip 20m x 100m!
I find if I mulch (which I do sometimes in the height of summer), then
unless I mow twice a week, you get visible clippings left. Do it more
often and it manages to "lose" them in the grass.
Doing about 60m x 60m (-minus the foot print of the house etc) here.
In effect yup...
I will have to have a look and see what happens if I take the whole
tunnel out like Harry suggested above.
(probably a moot point for this year now, since I finally got it low
enough at the weekend that it should be ok for the rest of the season -
but there was a point after three hours of mowing and sweeping and
mowing etc that I was almost ready to trade it in for a setup with built
in brush collection!)
I have a tractor mower and what can be a very wet area to mow. I
struggled with it for years - the tunnel constantly choking, backing up
to the deck, then choking the blade and fan. The tunnel runs back from
the deck, under the axle then feeds into a very large collector on the
It already had a flap at the rear, so that if the collector is taken
off, it drops the cut grass back on the ground.
I tried a home made panel to blank the front of the tunnel, that was
better, but still it choked the fan and blade. Only when I removed the
entire collection system did I acheive a reliable result.
The outlet from the deck is now completely open and it never chokes.
The only problem I have is with the first cut of the season, where
there are large clumps of cut grass. I allow that to dry, then go over
it a second time, where it becomes better distributed.
Sounds similar to mine, except the tunnel rises and runs over the rear
I notice that MTD have done a "diffuser" attachment for later models of
my tractor, that seems to defeat the grass box interlock, and deflect
the blown grass down onto the ground rather than allow it to flow
backwards. However since mine will clog even when the grass box is not
fitted, I don't expect that would actually help.
To be fair, that is something I have not tried - the tunnel is removable
on mine (one can replace it with the mulching plug, which is a shaped
plastic plug on the end of a long metal bar with some rubber straps that
restrain the far end of the bar at the back of the mower). That would
then leave the grass blowing straight out of the deck at the underside
of the drivers foot well I guess.
If I could get the first cut done more easily just dropping the grass
back on the ground, then I have a towed sweeper which could do the
 In the end I normally have to cut very slowly on the highest blade
setting, stopping every time it sounds like the motor is bogging down
and getting close to stalling, or disengaging the PTO to the blade,
driving a bit to allow the accumulated grass to fall out of the deck and
starting again. A much slower (and petrol thirsty) way to get it cut.
yes, But it could be removed to leave just a flappy metal guard on top
of the deack sticking out over the slot for 'no mulch, spit it out sideways'
That is safety as much as anything. You don't want stuff flying up or
your foot in the blades.
there's a good sort of picture of a typical way to do it.
shows a similar deck with the flappy METAL guard fitted.
Angle grinder and welder is a good starting point
A lie can travel halfway around the world while the truth is putting on
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